/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.jdbc.datasource.init;

import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.datasource.DataSourceUtils;
import org.springframework.util.Assert;

import javax.sql.DataSource;
import java.sql.Connection;

/**
 * Utility methods for executing a {@link DatabasePopulator}.
 *
 * @author Juergen Hoeller
 * @author Oliver Gierke
 * @author Sam Brannen
 * @since 3.1
 */
public abstract class DatabasePopulatorUtils {

    /**
     * Execute the given {@link DatabasePopulator} against the given {@link DataSource}.
     *
     * @param populator  the {@code DatabasePopulator} to execute
     * @param dataSource the {@code DataSource} to execute against
     * @throws DataAccessException if an error occurs, specifically a {@link ScriptException}
     */
    public static void execute(DatabasePopulator populator, DataSource dataSource) throws DataAccessException {
        Assert.notNull(populator, "DatabasePopulator must not be null");
        Assert.notNull(dataSource, "DataSource must not be null");
        try {
            Connection connection = DataSourceUtils.getConnection(dataSource);
            try {
                populator.populate(connection);
            }
            finally {
                DataSourceUtils.releaseConnection(connection, dataSource);
            }
        }
        catch (Throwable ex) {
            if (ex instanceof ScriptException) {
                throw (ScriptException) ex;
            }
            throw new UncategorizedScriptException("Failed to execute database script", ex);
        }
    }

}
